You will need one for every 90 square yards of attic area.
Mushroom roof vent installation.
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After you have chosen the spot make sure that there aren t any wires or other objects in the way.
There are very basic mushroom vents as well as more decorative mushroom vents that can be used for your project.
Rolled flange on vent stack to prevent weather infiltration.
You will need to select the best available spot for the vents.
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The pitch of your roof determines the time it will take your roofing contractor to complete the install.
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Determine the center point when you are running your ventilation pipe through the attic drill a hole in the roof from the attic out.
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The pitch also dictates the most practical type of vent.
To install the vent the roofer slips the flange the metal lip of the vent under shingles at the upper part of the hole and rests the flange on top of the shingles at the down slope part of the hole.
If your roofer cannot walk across the roof it may cost more to install your vent.
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For example choosing a dormer over a mushroom turbine.